Form 8-K

8-K — MONOLITHIC POWER SYSTEMS INC

Accession: 0001437749-26-014182

Filed: 2026-04-30

Period: 2026-04-30

CIK: 0001280452

SIC: 3674 (SEMICONDUCTORS & RELATED DEVICES)

Item: Results of Operations and Financial Condition

Item: Financial Statements and Exhibits

Documents

8-K — mpwr20260305_8k.htm (Primary)

EX-99.1 — EXHIBIT 99.1 (ex_929254.htm)

GRAPHIC (logosmall.jpg)

XML — IDEA: XBRL DOCUMENT (R1.htm)

8-K — FORM 8-K

8-K (Primary)

Filename: mpwr20260305_8k.htm · Sequence: 1

mpwr20260305_8k.htm

false

0001280452

2026-04-30

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of

the Securities Exchange Act of 1934

Date of Report (date of earliest event reported):

April 30, 2026

MONOLITHIC POWER SYSTEMS, INC.

(Exact name of registrant as specified in its charter)

Delaware

000-51026

77-0466789

(State or other jurisdiction of

(Commission

(I.R.S. Employer

incorporation or organization)

File Number)

Identification Number)

1555 Palm Beach Lakes Blvd.,

West Palm Beach, Florida 33401

(Address of principal executive offices)(Zip Code)(1)

(561) 839-3999

(Registrant’s telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐

Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐

Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐

Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐

Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class

Trading Symbol(s)

Name of each exchange on which registered

Common Stock, par value $0.001 per share

MPWR

The NASDAQ Global Select Market

Indicate by check mark whether the registrant is an emerging growth company as deﬁned in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

(1)

We have operations in multiple locations in the US, Europe and Asia and have not identified a single location as the Company’s headquarters. We are including this address to comply with the Securities and Exchange Commission’s requirements.

Item 2.02 Results of Operations and Financial Condition.

On April 30, 2026, Monolithic Power Systems, Inc. issued a press release regarding its financial results for the quarter ended March 31, 2026. The press release is attached hereto as Exhibit 99.1 and is incorporated by reference herein.

The information under Item 2.02 of this Current Report on Form 8-K and Exhibit 99.1 attached hereto are being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “1934 Act”), nor shall they be deemed incorporated by reference in any filing with the Securities and Exchange Commission under the 1934 Act or the Securities Act of 1933, as amended, except as shall be expressly set forth by specific reference in such filing.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits.

Exhibit

Description

99.1

Press release issued on April 30, 2026 for the quarter ended March 31, 2026.

104

Cover Page Interactive Data File (embedded within the Inline XBRL Document).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Date: April 30, 2026

By:

/s/ Robert Dean

Robert Dean

Interim Chief Financial Officer

EX-99.1 — EXHIBIT 99.1

EX-99.1

Filename: ex_929254.htm · Sequence: 2

ex_929254.htm

Exhibit 99.1

Monolithic Power Systems

Q1’26 Earnings Commentary

The highest quality power solutions for

Industrial Applications, Telecom Infrastructures,

Cloud Computing, Automotive, and Consumer Applications

Monolithic Power Systems Reports First Quarter Results on April 30, 2026

Monolithic Power Systems, Inc. (“MPS”) reported its results after market close on April 30, 2026 and will host a question-and-answer webinar at 2:00 p.m. PT / 5:00 p.m. ET. The webinar can be accessed from the Investor Relations section of the MPS website at www.monolithicpower.com.

Q1 2026 Financial Summary

(Unaudited)

GAAP

Q1'26

Q4'25

Q1'25

QoQ Change

YoY Change

Revenue ($M)

$804.2

$751.2

$637.6

7.1

26.1

Gross Margin

55.3

55.2

55.4

0.1 pts

(0.1) pts

Opex ($M)

$203.9

$214.3

$184.5

(4.9

10.5

Operating Margin

30.0

26.6

26.5

3.4 pts

3.5 pts

Net income ($M)

$193.2

$171.7

$135.1

12.6

43.1

Diluted EPS

$3.92

$3.49

$2.81

12.3

39.5

Non-GAAP

Q1'26

Q4'25

Q1'25

QoQ Change

YoY Change

Revenue ($M)

$804.2

$751.2

$637.6

7.1

26.1

Gross Margin

55.5

55.7

Flat

(0.2) pts

Opex ($M)

$158.3

$148.1

$133.5

7.0

18.6

Operating Margin

35.8

34.7

Flat

1.1 pts

Net income ($M)

$251.3

$235.3

$193.8

6.8

29.7

Diluted EPS

$5.10

$4.79

$4.04

6.5

26.2

Tax Rate

15.0

Flat

Revenue by End Market

Revenue

% Change

% of Revenue

End Market ($M)

Q1'26

Q4'25

Q1'25

QoQ

YoY

Q1'26

Q4'25

Enterprise Data

$262.8

$233.5

$132.9

12.6

97.7

32.7

31.1

Storage & Computing

174.4

162.1

188.5

7.6

(7.5

21.7

21.6

Automotive

152.4

151.0

144.9

0.9

5.1

18.9

20.1

Communications

111.5

83.7

71.8

33.1

55.5

13.9

11.1

Consumer

54.5

66.2

56.9

(17.5

(4.2

6.8

8.8

Industrial

48.6

54.7

42.6

(11.2

14.2

6.0

7.3

Total

$804.2

$751.2

$637.6

7.1

26.1

100

Ongoing Business Conditions

In the first quarter of 2026, MPS achieved record quarterly revenue of $804.2 million, 7.1% higher than the fourth quarter of 2025 and 26.1% higher than revenue in the first quarter of 2025.

Our quarterly performance was the result of our continued innovation, our consistent execution and the resilience of our diversified market strategy.

Q1 2026 highlights include:

•

Our Communications end market grew 33% sequentially on the strength of our power solutions for optical modules and switches.

•

The pipeline for our Automotive and Enterprise Data end markets, including server, continued to accelerate as we won multiple new projects across customers and regions.

•

We sampled our first high speed interface products for DDR5 at major customers.

•

MPS continued to grow our capacity past our original $4B plan, with a new goal of reaching $6B in the near future.

We continue to adjust to the fluid geopolitical and macro-economic environment, but our diversified market strategy remains unchanged:

•

MPS focuses on innovation and solving our customers’ most challenging problems.

•

We consistently invest in new technologies that allow us to expand into new end markets and applications.

•

We continue to expand and diversify our global supply chain allowing us to capture future growth opportunities, maintain supply stability, and rapidly adapt to market changes as they occur.

“Our results demonstrate the strength of our diversified model and our continued success in transforming from a chip-only, semiconductor supplier to a full service, silicon-based solutions provider,” said Michael Hsing, CEO and founder of MPS.

Q1 2026 Revenue Results

MPS reported first quarter revenue of $804.2 million, 7.1% higher than the fourth quarter of 2025 and 26.1% higher than the first quarter of 2025. Compared with the fourth quarter of 2025, sales in Communications, Enterprise Data, Storage and Computing and Automotive improved sequentially.

First quarter 2026 Communications revenue of $111.5 million was up 33.1% from the fourth quarter of 2025 primarily as a result of higher sales of power solutions for optical modules and switches. First quarter 2026 Communications revenue was up 55.5% year over year. Communications sales represented 13.9% of our total first quarter 2026 revenue compared with 11.1% the fourth quarter of 2025.

In our Enterprise Data market, first quarter 2026 revenue of $262.8 million increased 12.6% from the fourth quarter of 2025. The sequential increase was driven by higher sales of our power management solutions for AI and server applications. First quarter 2026 Enterprise Data revenue was up 97.7% year over year. Enterprise Data revenue represented 32.7% of our total first quarter 2026 revenue compared with 31.1% in the fourth quarter of 2025.

First quarter 2026 Storage and Computing revenue of $174.4 million increased 7.6% from the fourth quarter of 2025 primarily on higher sales for storage power management solutions. First quarter 2026 Storage and Computing revenue was down 7.5% year over year. Storage and Computing revenue represented 21.7% of MPS’s first quarter 2026 revenue compared with 21.6% in the fourth quarter of 2025.

First quarter Automotive revenue of $152.4 million increased 0.9% from the fourth quarter of 2025 as higher sales for ADAS power solutions were partially offset by lower sales of USB solutions. First quarter 2026 Automotive revenue was up 5.1% year over year. Automotive revenue represented 18.9% of MPS’s first quarter 2026 revenue compared with 20.1% in the fourth quarter of 2025.

First quarter 2026 Industrial revenue of $48.6 million decreased 11.2% from the fourth quarter of 2025. First quarter 2026 Industrial revenue was up 14.2% year over year. Industrial revenue represented 6.0% of our total first quarter 2026 revenue compared with 7.3% in the fourth quarter of 2025.

First quarter 2026 Consumer revenue of $54.5 million decreased 17.5% from the fourth quarter of 2025. First quarter 2026 Consumer revenue was down 4.2% year over year. Consumer revenue represented 6.8% of our total first quarter 2026 revenue compared with 8.8% in the fourth quarter of 2025.

Q1 2026 Gross Margin & Operating Income

GAAP gross margin was 55.3%, 0.1 percentage points higher than the fourth quarter of 2025. Our GAAP operating income was $241.2 million compared to $199.9 million reported in the fourth quarter of 2025.

Non-GAAP gross margin for the first quarter of 2026 was 55.5%, flat to the fourth quarter of 2025. Our non-GAAP operating income was $288.0 million compared to $269.0 million reported in the fourth quarter of 2025.

Q1 2026 Operating Expenses

Our GAAP operating expenses were $203.9 million in the first quarter of 2026 compared with $214.3 million in the fourth quarter of 2025. Our Non-GAAP operating expenses were $158.3 million, up from $148.1 million in the fourth quarter of 2025.

The differences between non-GAAP operating expenses and GAAP operating expenses for the quarters discussed here are primarily stock-based compensation and related expenses and deferred compensation plan income.

Total stock-based compensation and related expenses, including approximately $1.7 million charged to cost of goods sold, was $48.5 million compared with $66.9 million recorded in the fourth quarter of 2025.

The Bottom Line

First quarter 2026 GAAP net income was $193.2 million or $3.92 per fully diluted share, compared with $171.7 million or $3.49 per fully diluted share in the fourth quarter of 2025.

First quarter 2026 non-GAAP net income was $251.3 million or $5.10 per fully diluted share, compared with $235.3 million or $4.79 per fully diluted share in the fourth quarter of 2025.

First quarter 2026 non-GAAP tax rate of 15% was flat to the fourth quarter of 2025.

There were 49.2 million fully diluted shares outstanding at the end of the first quarter of 2026.

Balance Sheet and Cash Flow

Cash, cash equivalents and short-term investments were $1,367.1 million at the end of the first quarter of 2026 compared to $1,256.5 million at the end of the fourth quarter of 2025. For the first quarter of 2026, MPS generated operating cash flow of $250.3 million compared with fourth quarter of 2025 operating cash flow of $104.9 million.

Accounts receivable at the end of the first quarter of 2026 were $302.1 million, representing 34 days of sales outstanding, which was 3 days higher than the 31 days reported at the end of the fourth quarter of 2025.

Our internal inventories at the end of the first quarter of 2026 were $619.2 million, up from $564.6 million at the end of the fourth quarter of 2025. Days of inventory of 157 days at the end of the first quarter of 2026 was 4 days higher than at the end of the fourth quarter of 2025.

Comparing current inventory levels using next quarter’s projected revenue, days of inventory at the end of the first quarter of 140 days was 3 days lower than at the end of the fourth quarter of 2025.

Selected Balance Sheet and Inventory Data

(Unaudited)

Q1'26

Q4'25

Q1'25

Cash, Cash Equivalents, and Short-Term Investments

$ 1,367.1 M

$ 1,256.5 M

$ 1,026.7 M

Operating Cash Flow

$ 250.3 M

$ 104.9 M

$ 256.4 M

Accounts Receivable

$ 302.1 M

$ 255.6 M

$ 214.9 M

Days of Sales Outstanding

34 Days

31 Days

Internal Inventories

$ 619.2 M

$ 564.6 M

$ 454.8 M

Days of Inventory (current quarter revenue)

157 Days

153 Days

146 Days

Days of Inventory (next quarter revenue)

140 Days

143 Days

139 Days

Q2 2026 Business Outlook

For the second quarter of 2026 ending June 30, we are forecasting:

•

Revenue in the range of $890 million to $910 million.

•

GAAP gross margin in the range of 55.1% to 55.7%.

•

Non-GAAP gross margin in the range of 55.3% to 55.9%, which excludes the impact from stock-based compensation and related expenses as well as the impact from amortization of acquisition-related intangible assets.

•

Total stock-based compensation and related expenses in the range of $53.8 million to $55.8 million including approximately $1.7 million that would be charged to cost of goods sold.

•

GAAP operating expenses between $219.1 million and $225.1 million.

•

Non-GAAP operating expenses in the range of $167.0 million to $171.0 million. This estimate excludes stock-based compensation and related expenses in the range of $52.1 million to $54.1 million.

•

Interest and other income in the range from $7.4 million to $7.8 million before foreign exchange gains or losses.

•

Non-GAAP tax rate of 15% for 2026.

•

Fully diluted shares outstanding in the range of 49.1 to 49.5 million shares.

For further information, contact:

Tony Balow

Vice President, Finance

Monolithic Power Systems, Inc.

MPSInvestor.Relations@monolithicpower.com

Safe Harbor Statement

This earnings commentary contains, and statements that will be made during the accompanying webinar will contain, forward-looking statements, as that term is defined in the Private Securities Litigation Reform Act of 1995, that should not be unduly relied upon, including under the “Q2’26 Business Outlook” section herein, our statement regarding our business focus, our statement regarding our capacity growth goal, our statement regarding our prospects for Automotive and Enterprise Data end markets, our statement regarding the expansion and diversification of our supply chain to allow us to capture future growth opportunities, maintain supply stability and swiftly adapt to market changes as they occur, and our statement regarding the major customer sampling of our first high speed interface products for DDR5, including, among other things, (i) projected revenue, GAAP and non-GAAP gross margin, GAAP and non-GAAP operating expenses, stock-based compensation and related expenses, amortization of acquisition-related intangible assets, other income before foreign exchange gains or losses, and fully diluted shares outstanding, (ii) our outlook for the second quarter of fiscal year 2026 and the near-term, medium-term and long-term prospects of MPS, including our ability to adapt to changing market conditions, performance against our business plan, our ability to grow despite the various challenges facing our business, our industry and the global economic environment, potential new business segments, our continued investment in research and development (“R&D”), expected revenue growth, customers’ acceptance of our new product offerings, the prospects of our new product development, our expectations regarding market and industry trends and prospects, and our goal to expand our capacity and the impact it may have on our business, (iii) our ability to penetrate new markets and expand our market share, (iv) our ability to reduce our expenses, and (vi) statements regarding the assumptions underlying or relating to any statement described above. These forward-looking statements are not historical facts or guarantees of future performance or events, are based on current expectations, estimates, beliefs, assumptions, goals, and objectives, and involve significant known and unknown risks, uncertainties and other factors that may cause actual results to be materially different from the results expressed by these statements. Readers of this earnings commentary and listeners to the accompanying conference call are cautioned not to place undue reliance on any forward-looking statements, which speak only as of the date hereof. Factors that could cause actual results to differ include, but are not limited to, continued uncertainties in the global economy, including due to current and potential global conflicts, global tariffs, export controls and retaliatory measures and announcements regarding same, inflation, consumer sentiment and other factors; adverse events arising from orders or regulations of governmental entities, including such orders or regulations that impact our customers or suppliers, and adoption of new or amended accounting standards; adverse changes in laws and government regulations such as tariffs on imports of foreign goods, export regulations and export classifications, and tax laws or the interpretation of same, including in foreign countries where MPS has offices or operations; the effect of export controls, trade and economic sanctions regulations and other regulatory or contractual limitations on our ability to sell or develop our products in certain foreign markets, particularly in China; our ability to obtain governmental licenses and approvals for international trading activities or technology transfers, including export licenses; acceptance of, or demand for, our products, in particular the new products launched recently, being different than expected; our ability to increase market share in our targeted markets; difficulty in predicting or budgeting for future customer demand and channel inventories, expenses and financial contingencies (including as a result of any impact from current and potential global conflicts); our ability to efficiently and effectively develop new products and receive a return on our R&D expense investment; our ability to attract new customers and retain existing customers; our ability to meet customer demand for our products due to constraints on our third-party suppliers’ ability to manufacture sufficient quantities of our products or otherwise; our ability to expand manufacturing capacity to support future growth; adverse changes in production and testing efficiency of our products; any political, cultural, military, regulatory, economic, foreign exchange and operational changes in China, where a significant portion of our manufacturing capacity comes from; any market disruptions or interruptions in our schedule of new product development releases; our ability to manage our inventory levels; adequate supply of our products from our third-party manufacturing partners; adverse changes or developments in the semiconductor industry generally, which is cyclical in nature, and our ability to adjust our operations to address such changes or developments; the ongoing consolidation of companies in the semiconductor industry; competition generally and the increasingly competitive nature of our industry; our ability to realize the anticipated benefits of companies and products that MPS acquires, and our ability to effectively and efficiently integrate these acquired companies and products into our operations; the risks, uncertainties and costs of litigation in which MPS is involved; the outcome of any upcoming trials, hearings, motions and appeals; the adverse impact on our financial performance if its tax and litigation provisions are inadequate; our ability to effectively manage our growth and attract and retain qualified personnel; the effect of epidemics and pandemics on the global economy and on our business; the risks associated with the financial market, economy, global tariffs, export controls and retaliatory measures and announcements regarding same, and geopolitical uncertainties, including current and potential global conflicts; the Company’s ability to timely and adequately remediate its material weakness; and other important risk factors identified under the caption “Risk Factors” and elsewhere in our Securities and Exchange Commission (“SEC”) filings, including, but not limited to, our Annual Report on Form 10-K filed with the SEC on February 27, 2026. MPS assumes no obligation to update the information in this earnings commentary or in the accompanying webinar.

Non-GAAP Financial Measures

This earnings commentary contains references to certain non-GAAP financial measures. Non-GAAP net income, non-GAAP net income per share, non-GAAP gross margin, non-GAAP operating expenses, non-GAAP operating income, non-GAAP other income, net, and non-GAAP income before income taxes differ from net income, net income per share, gross margin, operating expenses, operating income, other income, net, and income before income taxes determined in accordance with U.S. Generally Accepted Accounting Principles (“GAAP”). Non-GAAP net income and non-GAAP net income per share exclude the effect of stock-based compensation and related expenses, which include stock-based compensation expense and employer payroll taxes in relation to the stock-based compensation, amortization of acquisition-related intangible assets, net deferred compensation plan income, and related tax effects. Non-GAAP gross margin excludes the effect of stock-based compensation and related expenses, amortization of acquisition-related intangible assets and deferred compensation plan income.

Non-GAAP operating expenses exclude the effect of stock-based compensation and related expenses, amortization of acquisition-related intangible assets and deferred compensation plan income. Non-GAAP operating income excludes the effect of stock-based compensation and related expenses, amortization of acquisition-related intangible assets and deferred compensation plan income. Non-GAAP other income, net excludes the effect of deferred compensation plan expense. Non-GAAP income before income taxes excludes the effect of stock-based compensation and related expenses, amortization of acquisition-related intangible assets and net deferred compensation plan income. Projected non-GAAP gross margin excludes the effect of stock-based compensation and related expenses, and amortization of acquisition-related intangible assets. Projected non-GAAP operating expenses exclude the effect of stock-based compensation and related expenses. These non-GAAP financial measures are not prepared in accordance with GAAP and should not be considered as a substitute for, or superior to, measures of financial performance prepared in accordance with GAAP. A schedule reconciling non-GAAP financial measures is included at the end of this press release. MPS utilizes both GAAP and non-GAAP financial measures to assess what it believes to be its core operating performance and to evaluate and manage its internal business and assist in making financial operating decisions. MPS believes that the inclusion of non-GAAP financial measures, together with GAAP measures, provides investors with an alternative presentation useful to investors’ understanding of MPS’s core operating results and trends. Additionally, MPS believes that the inclusion of non-GAAP measures, together with GAAP measures, provides investors with an additional dimension of comparability to similar companies. However, investors should be aware that non-GAAP financial measures utilized by other companies are not likely to be comparable in most cases to the non-GAAP financial measures used by MPS. See the GAAP to Non-GAAP reconciliations in the tables set forth below.

About Monolithic Power Systems

MPS is a fabless global company that provides high-performance, semiconductor-based power electronics solutions. MPS’s mission is to reduce energy and material consumption to improve all aspects of quality of life and create a sustainable future. Founded in 1997 by our CEO Michael Hsing, MPS has three core strengths: deep system-level knowledge, strong semiconductor design expertise, and innovative proprietary technologies in the areas of semiconductor processes, system integration, and packaging. These combined advantages enable MPS to deliver reliable, compact, and monolithic solutions that are highly energy-efficient, cost-effective, and environmentally responsible while providing a consistent return on investment to our stockholders. MPS can be contacted through its website at www.monolithicpower.com or its support offices around the world.

Monolithic Power Systems, MPS, and the MPS logo are registered trademarks of Monolithic Power Systems, Inc. in the U.S. and trademarked in certain other countries.

Monolithic Power Systems, Inc.

Condensed Consolidated Balance Sheets

(Unaudited, in thousands, except par value)

March 31,

December 31,

2026

2025

ASSETS

Current assets:

Cash and cash equivalents

1,062,930

1,099,302

Short-term investments

304,179

157,243

Accounts receivable, net

302,138

255,626

Inventories

619,159

564,649

Other current assets

42,689

106,982

Total current assets

2,331,095

2,183,802

Property and equipment, net

693,864

627,689

Acquisition-related intangible assets, net

8,503

8,790

Goodwill

25,944

Deferred tax assets, net

1,182,845

1,182,883

Other long-term assets

206,615

165,091

Total assets

4,448,866

4,194,199

LIABILITIES AND STOCKHOLDERS’ EQUITY

Current liabilities:

Accounts payable

174,499

138,272

Accrued compensation and related benefits

98,768

85,963

Other accrued liabilities

213,691

145,130

Total current liabilities

486,958

369,365

Income tax liabilities

75,022

Deferred tax liabilities

90,316

90,480

Other long-term liabilities

119,160

127,835

Total liabilities

771,456

662,702

Commitments and contingencies

Stockholders’ equity:

Common stock and additional paid-in capital: $0.001 par value; shares authorized: 150,000; shares issued and outstanding: 49,129 and 48,709, respectively

983,926

936,998

Retained earnings

2,703,596

2,609,651

Accumulated other comprehensive loss

(10,112

)

(15,152

)

Total stockholders’ equity

3,677,410

3,531,497

Total liabilities and stockholders’ equity

4,448,866

4,194,199

Monolithic Power Systems, Inc.

Condensed Consolidated Statements of Operations

(Unaudited, in thousands, except per share amounts)

Three Months Ended March 31,

2026

2025

Revenue

804,185

637,554

Cost of revenue

359,120

284,324

Gross profit

445,065

353,230

Operating expenses:

Research and development

100,566

92,227

Selling, general and administrative

103,347

92,244

Total operating expenses

203,913

184,471

Operating income

241,152

168,759

Other income, net

6,030

5,131

Income before income taxes

247,182

173,890

Income tax expense

53,956

38,838

Net income

193,226

135,052

Net income per share:

Basic

3.94

2.82

Diluted

3.92

2.81

Weighted-average shares outstanding:

Basic

49,097

47,851

Diluted

49,242

48,006

RECONCILIATION OF NET INCOME TO NON-GAAP NET INCOME

(Unaudited, in thousands, except per share amounts)

Three Months Ended March 31,

2026

2025

Net income

193,226

135,052

Adjustments to reconcile net income to non-GAAP net income:

Stock-based compensation and related expenses

48,538

53,811

Amortization of acquisition-related intangible assets

320

Deferred compensation plan income, net

(378

)

Tax effect

9,606

4,636

Non-GAAP net income

251,312

193,813

Non-GAAP net income per share:

Basic

5.12

4.05

Diluted

5.10

4.04

Shares used in the calculation of non-GAAP net income per share:

Basic

49,097

47,851

Diluted

49,242

48,006

RECONCILIATION OF GROSS MARGIN TO NON-GAAP GROSS MARGIN

(Unaudited, in thousands)

Three Months Ended March 31,

2026

2025

Gross profit

445,065

353,230

Gross margin

55.3

55.4

Adjustments to reconcile gross profit to non-GAAP gross profit:

Stock-based compensation and related expenses

1,682

1,706

Amortization of acquisition-related intangible assets

287

Deferred compensation plan income

(643

)

(163

)

Non-GAAP gross profit

446,391

355,060

Non-GAAP gross margin

55.5

55.7

RECONCILIATION OF OPERATING EXPENSES TO NON-GAAP OPERATING EXPENSES

(Unaudited, in thousands)

Three Months Ended March 31,

2026

2025

Total operating expenses

203,913

184,471

Adjustments to reconcile total operating expenses to non-GAAP total operating expenses:

Stock-based compensation and related expenses

(46,856

)

(52,105

)

Amortization of acquisition-related intangible assets

(33

)

(33

)

Deferred compensation plan income

1,323

1,193

Non-GAAP operating expenses

158,347

133,526

RECONCILIATION OF OPERATING INCOME TO NON-GAAP OPERATING INCOME

(Unaudited, in thousands)

Three Months Ended March 31,

2026

2025

Total operating income

241,152

168,759

Adjustments to reconcile total operating income to non-GAAP total operating income:

Stock-based compensation and related expenses

48,538

53,811

Amortization of acquisition-related intangible assets

320

Deferred compensation plan income

(1,966

)

(1,356

)

Non-GAAP operating income

288,044

221,534

RECONCILIATION OF OTHER INCOME, NET, TO NON-GAAP OTHER INCOME, NET

(Unaudited, in thousands)

Three Months Ended March 31,

2026

2025

Total other income, net

6,030

5,131

Adjustments to reconcile other income, net to non-GAAP other income, net:

Deferred compensation plan expense

1,588

1,350

Non-GAAP other income, net

7,618

6,481

RECONCILIATION OF INCOME BEFORE INCOME TAXES TO NON-GAAP INCOME BEFORE INCOME TAXES

(Unaudited, in thousands)

Three Months Ended March 31,

2026

2025

Total income before income taxes

247,182

173,890

Adjustments to reconcile income before income taxes to non-GAAP income before income taxes:

Stock-based compensation and related expenses

48,538

53,811

Amortization of acquisition-related intangible assets

320

Deferred compensation plan income, net

(378

)

Non-GAAP income before income taxes

295,662

228,015

2026 SECOND QUARTER OUTLOOK

RECONCILIATION OF GROSS MARGIN TO NON-GAAP GROSS MARGIN

(Unaudited)

Three Months Ending

June 30, 2026

Low

High

Gross margin

55.1

55.7

Adjustment to reconcile gross margin to non-GAAP gross margin:

Stock-based compensation and other expenses

0.2

Non-GAAP gross margin

55.3

55.9

RECONCILIATION OF OPERATING EXPENSES TO NON-GAAP OPERATING EXPENSES

(Unaudited, in thousands)

Three Months Ending

June 30, 2026

Low

High

Operating expenses

219,100

225,100

Adjustments to reconcile operating expenses to non-GAAP operating expenses:

Stock-based compensation and other expenses

(52,100

)

(54,100

)

Non-GAAP operating expenses

167,000

171,000

GRAPHIC

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Document And Entity Information

Apr. 30, 2026

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MONOLITHIC POWER SYSTEMS, INC.

Document, Type

8-K

Document, Period End Date

Apr. 30, 2026

Entity, Incorporation, State or Country Code

Entity, File Number

000-51026

Entity, Tax Identification Number

77-0466789

Entity, Address, Address Line One

1555 Palm Beach Lakes Blvd.

Entity, Address, City or Town

West Palm Beach

Entity, Address, State or Province

Entity, Address, Postal Zip Code

33401

City Area Code

561

Local Phone Number

839-3999

Written Communications

false

Soliciting Material

false

Pre-commencement Tender Offer

false

Pre-commencement Issuer Tender Offer

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Title of 12(b) Security

Common Stock

Trading Symbol

MPWR

Security Exchange Name

NASDAQ

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Entity, Central Index Key

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